well maybe its better that each player when start to play get notification in game log, who remind hem who its target, and that with kill someon other will lost a game,offcourse these will be hidden like in fog games,and only player who its in turn to play can se hes own message.
2010-11-27 17:20:31 - Incrementing game to round 3
2010-11-27 21:44:52-notification: yours target are green, killing other opponet will cause imediatly defeat and end of game
2010-11-27 21:44:52 - callmefrank received 3 troops for 4 regions
these only can see in these example callmefrank, and all other players can only see
-----------------------------2010-11-27 21:44:52-notification: yours target are ?, killing other opponet will cause imediatly defeat and end of game
its enough that in first turn each player get these notification to understand what hes playing, and if again someon kill wrong target,then you play with not so smart people. then you need to avoide playing with these players.
Why its need?
Well these probably will not eliminate mistakes what new player made in assasin games ,when eliminate wrong players(target), but these will definitly alot reduce these mistake,and help to new player to understand what assasing games mean.